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CVE-2026-93353— copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/chattr Handlers

Quick assessment

Affected
9001 copyparty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Copyparty 的 SFTP 前端存在一个卷（volume）限制绕过漏洞。该漏洞允许已认证的 SFTP 用户通过利用三个绕过 卷标志（volflag）强制执行的处理器，在允许的卷边界之外创建、删除或截断任意路径。 具体而言， 、 和 处理器在使用 、 和 构建目标路径时，并未调用 访问检查函数。这使得攻击者能够利用符号链接遍历出某个卷的顶级目录，并对账户未被授权访问的任何卷之外的路径执行未经授权的 SSH_FXP_SETSTAT 操作，从而实现文件的创建、删除或截断。

CVSS 5.3 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
9001 copyparty ≤ 1.20.24 affected
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I. Basic Information for CVE-2026-93353

Vulnerability Information
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Vulnerability Title
copyparty SFTP Volume Restriction Bypass via mkdir/rmdir/chattr Handlers
Source: CVE Program / CVE List V5
Vulnerability Description
copyparty contains a volume restriction bypass vulnerability in its SFTP front end that allows authenticated SFTP users to create, remove, and truncate arbitrary paths outside permitted volume boundaries by exploiting three handlers that bypass the xvol volflag enforcement. The _mkdir, _rmdir, and _chattr handlers construct destination paths using vfs.get(), vn.canonical(), and os.path.join() without invoking the chk_ap access check, enabling attackers to traverse symlinks leaving a volume's top directory and perform unauthorized file creation, deletion, or truncation via SSH_FXP_SETSTAT operations on paths outside any volume the account is authorized to access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
9001 copyparty 0 ~ 1.20.24 -

II. Public POCs for CVE-2026-93353

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III. Intelligence Information for CVE-2026-93353

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Vendor Advisories for CVE-2026-93353 (1)

Security Blog Posts for CVE-2026-93353 (1)

IV. Related Vulnerabilities

Same product: copyparty
Same vendor: 9001
Same weakness: CWE-59

V. Comments for CVE-2026-93353

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